A man torched an apartment complex with a flare gun after an argument over an $8 debt, killing a 15-month-old girl, critically burning her parents and injuring seven others, police said.

Rescue crews made their way through the rubble Friday in search of two teen-agers unaccounted for. Forty-eight people escaped unharmed.Bruce Wayne Campbell, a former tenant of the two-story, 24-unit La Villita complex, was jailed on $75,000 bail on charges of arson, police said.

The fire apparently was started about 2 a.m. Thursday with a flare gun belonging to Campbell, a friend of a former manager of the gutted complex, police said.